splunk-security_content/docs/_posts/2020-11-18-disabling_remote_user_account_control.md

title, excerpt, categories, last_modified_at, toc, toc_label, tags

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Disabling Remote User Account Control	Bypass User Account Control, Abuse Elevation Control Mechanism	Endpoint	2020-11-18	true		Bypass User Account Control Privilege Escalation Defense Evasion Abuse Elevation Control Mechanism Privilege Escalation Defense Evasion Splunk Enterprise Splunk Enterprise Security Splunk Cloud

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Description

The search looks for modifications to registry keys that control the enforcement of Windows User Account Control (UAC).

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel:
• Last Updated: 2020-11-18
• Author: David Dorsey, Patrick Bareiss, Splunk
• ID: bbc644bc-37df-4e1a-9c88-ec9a53e2038c

ATT&CK

ID	Technique	Tactic
T1548.002	Bypass User Account Control	Privilege Escalation, Defense Evasion

| T1548 | Abuse Elevation Control Mechanism | Privilege Escalation, Defense Evasion |

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Registry where Registry.registry_path=*HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\EnableLUA* Registry.registry_value_data="0x00000000" by Registry.dest, Registry.registry_key_name Registry.user Registry.registry_path Registry.registry_value_data Registry.action 
| `drop_dm_object_name(Registry)` 
| `disabling_remote_user_account_control_filter`

Associated Analytic Story

• Windows Defense Evasion Tactics
• Suspicious Windows Registry Activities
• Remcos

How To Implement

To successfully implement this search, you must be ingesting data that records registry activity from your hosts to populate the endpoint data model in the registry node. This is typically populated via endpoint detection-and-response product, such as Carbon Black, or via other endpoint data sources, such as Sysmon. The data used for this search is typically generated via logs that report registry modifications.

Required field

• _time
• Registry.registry_path
• Registry.registry_value_name
• Registry.dest
• Registry.registry_key_name
• Registry.user
• Registry.action

Kill Chain Phase

• Actions on Objectives

Known False Positives

This registry key may be modified via administrators to implement a change in system policy. This type of change should be a very rare occurrence.

RBA

Risk Score	Impact	Confidence	Message
42.0	70	60	The Windows registry keys that control the enforcement of Windows User Account Control (UAC) were modified on dest by user.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1548.002/atomic_red_team/windows-sysmon.log

source | version: 4